Improvement in coffee-boilers



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UNITED STATES PATENT OFFICE.

EDWARD F. woODwARD, oF BROOKLYN, NEW YORK.

IMPROVEMEN-rm corres-Bomans.

ATo' all whom it may concern.'

Be it known that LEDWARD F.. WOOD WARD, of the .city of Brooklyn, in the county of Kings and State of' New York, have invented certain new and useful Improvement-s in Coffee-'Pots and other Boilers for Making Extracts, time., a part of which are also ap plicable to other boilers-for heating, making steam, ne.; and I do hereby describe and as certain my said improvements, referring to the accompanying drawings, in which- Figure 1 is a general view of the coffeepot. Fig. 2 is a vertical section through the center. Fig. 3 shows the cone-holder for the ground coffee, &c. Fig. 4 is a plan of the bottom of the boiler.

My improvements consist in so eonstructing a coieepot or other boileras to insure a perfect and rapid circulation of the water or other liquid within the'boiler, so as to dovelop the greatest capacity 'for generating steam.

The construction is as follows: I -forin t-he sides, handle, and spout of the coifce-pot in any of the usual and convenient ways, one

'of which is shown in the drawings. The

in Fig. 2'. I'propose to make this coil in the following way: I take a plate ofcopper or other. suitable metal and strike up or otherwise form (by any of the known devices for.

forming plate metal) the plate into a sprallycorrugated shape, representing the semifdiameter ofthe tubular bottom for the lower half. I `then forma similar plate to correspond therewith, so that when the'two are put together` they shall complete the tube. In the upper plate there is an opening into the outer end of the tube, and at the center there is a similar opening. To the latter an upright tube is affixed, as 'at 2. When the bottom thus constructed is iaftired in place, both plates may be soldered,'seamed, or riveted in place; or forsome purposes the inner plate may be removable.

Then the boiler is used for making a deeoetion--as coifee, risc-the top of the up-v right pipe a should be covered with a cap of `wire-gauze or perforated metal, and onto it though it maybe Iof cylindrical or other shape. A eoveris tted onto the rim, and on the under side of the cover of the boiler a perforated cone c'is fitted, .the base of which rests upon the top ofthe receiver and prevents its rising by the current Of liquid,

which is put into rapid circulation by the form of the bottom of -the boiler.

The action is as follows: Heat is applied to the bottom ofy the boiler, which causes an upward current through the center tube ci; This induces a downward flow at the openinginto the coil at the periphery, and as the" heatincre'ases the 'current is quickened in the coil. As-the hot water is thrown out into the receiver. b, it is driven through the coffee or other material therein and exhausts the soluble properties thereof inthe most eiiicient and perfect manner.' The cone c,

which holds down the receiver b, further serves to conduct heat to ak reservoir or supplementary boiler ci above wheirused, and this effect may be further aided by a central tube within the said reservoir d, into which the steam from the lower boiler rises, and through which it may, if desired, be made to pass. Inthe upper reservoir milk or eggs may be boiled, or it may be used for other purposes. A ,third reservoir may be added above, if found advantageous, for any pui-,

pose, and be in like manner heated from thc first boiler. I

It is obvious that the bottomV plate or that above it may be made flat, the tube being only formed in one of them, in which case Vone side of the tube will be fiat.-

-Having thus fully described my improvement in4 boilers, I 'wish it to be understood that I do not claim heating boilers or other" vessels by a coil of pipe, as that has before been done; but

W'hat I do claim as my invention, and for whichI desire Letters Patent, is-l 1. Causing 'a circulation by means of a tubular or channel-formed bottom,l as herein scribed. Y l

EDWARD F. WVOODVARD. Witnesses.'

' CHARLES F. SANFORD,

J. S. MERRIAM. 

